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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '116672a7468870156df45421477d575ed096e9a881527e8825e9d8b9a2457f1d' 
  AND token = '5M91ErvB6935LohszrXWkQuEb7DEHPNZNr4Nt5CgA8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}